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          精英家教網 > 高中英語 > 題目詳情
          

			
          
				
          Little _____ about A-H1N1 so far, so there is no doubt that many people are afraid when talking about the 
          disease. 

          A. did scientists know 
          B. scientists have known 
          C. have scientists known
          D. had scientists known 
          			
          

			
			
			
		
          



							
          
				相關習題
			
          	
						
          
			
          
				科目：高中英語
				來源：安徽省模擬題
				題型：單選題
			
          
									
          Little _____ about A-H1N1 so far, so there is no doubt that many people are afraid when talking about the 
          disease. 
          

          [     ]
          A. did scientists know 
          B. scientists have known 
          C. have scientists known
          D. had scientists known 
          

			
          
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